Load errors give no detail in AuraDB Free when importing dump from desktop

I am evaluating a move to Auradb from our own self hosted version of Neo4j. Im testing a migration so have taken the following steps -

Create a free instance in auradb
load a reduced version of our db into desktop
dump from desktop to create a .dump file
import the .dump into auradb free instance by drag and drop.

The db is running fine in desktop and has the following spec -

Version 4.4.11
Edition Enterprise
Nodes 171225
Relationships 249306
labels 34
Relationship Types 24
Property Keys 152

When I drop the file into the load window I see a full upload and then the loading status. Then after a period of time I see 'Loading Failed' .

I can see no way to determine why the loading has failed. I have tried it a few times and have deleted and created a new instance but still get the same error. I believe the db is within the limits for the free db unless I am missing something?

What else could be causing the upload to fail?

I would add that the file size is only 75.3MB